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Ethernet is industry standard for computer networking, however back in 1970s IBM introduced a competing technology called Token Ring.
While Token Ring has all but faded from mainstream, some hardcore IBM'ers still use it.
If you're going to be working in such an environment, you'll need a PC Card to connect to network.
Extra 4: Foreign power kit
If you travel abroad, you're bound to run into a wide variety of power schemes - power schemes that aren't compatible with your laptop.
When you're away from homeland, you'll need some sort of adapter/converter if you want to plug into a local wall outlet.
These are relatively inexpensive and can be easily found online.
Copyright (c) 2004 HowToBuyALaptop.com
The author, computer journalist John San Filippo, has created the definitive guide for buying a laptop computer and mobile accessories. Visit the site at: http://HowToBuyALaptop.com